Description
The ebm-papst S1G250-AI37-52 (also known as S1G250AI3752) is an industrial-grade 250 mm (9.84 in) EC axial fan assembly integrated with an electronically commutated M1G074-BF motor and an integrated protective guard grille engineered for short nozzle installations. Operating across a wide 16 to 28 VDC range at a nominal 24 VDC, this brushless assembly delivers an airflow volume of 1,130 CFM (1,920 m³/h) at 2,750 RPM while drawing 105 W in free air conditions. Constructed with 9 sickle-shaped sheet steel blades and heavy-duty dual ball bearings, the unit provides reliable continuous S1 duty across an operating temperature range of -25 °C to +60 °C (-13 °F to +140 °F). Standard electrical provisions include closed-loop control via a 0–10 VDC / PWM interface, an open-collector tachometer speed feedback line, reverse polarity protection, and a lateral 4-conductor AWG 20 spliced cable.
Key Features
- Aerodynamic S-Series Impeller: Nine sickle-shaped sheet steel blades optimized for minimal acoustic turbulence and high back-pressure tolerance.
- High-Efficiency EC Motor: Brushless M1G074-BF permanent-magnet motor delivering 2,750 RPM with low 105 W power consumption.
- Integrated Protective Grille: Phosphated and black plastic-coated steel guard designed specifically for short nozzle mounting architectures.
- Dynamic Speed Control: Accepts 0–10 VDC or PWM control input with input resistance greater than 100 kΩ for demand-based cooling.
- Speed Feedback Monitoring: Integrated open-collector tachometer output generating 3 pulses per revolution for real-time RPM supervision.
- Robust Protection Architecture: Features soft start, motor current limitation, locked-rotor protection, reverse polarity protection, and IP42 ingress sealing.
- Flexible Mounting Configuration: Dual precision ball bearing system supports any spatial installation position with S1 continuous operation.
Technical Specifications
| Manufacturer | ebm-papst |
|---|---|
| Manufacturer Part Number (MPN) | S1G250-AI37-52 |
| Alternate Part Number | S1G250AI3752 |
| Integrated Motor Model | M1G074-BF |
| Product Series | S Series (Sickle-shaped blades) |
| Product Category | EC Axial Fans |
| Fan / Component Type | EC axial fan with guard grille for short nozzle |
| Supply Type | DC (Brushless Electronically Commutated) |
| Nominal Voltage | 24 VDC |
| Operating Voltage Range | 16 to 28 VDC |
| Speed (RPM) | 2,750 RPM (Free Air @ 24 VDC) / 2,905 RPM (Free Air @ 28 VDC) |
| Power Rating | 105 W (Nominal Free Air @ 24 VDC) |
| Max. Power Consumption | 134 W (@ 28 VDC, max load) |
| Rated Current | 5.0 A (Free Air @ 24 VDC) |
| Max. Current Draw | 5.93 A (@ 28 VDC, max load) |
| Airflow | 1,130 CFM (1,920 m³/h @ 24 VDC) / 1,205 CFM (2,045 m³/h @ 28 VDC) |
| Max. Static / Back Pressure | 0.56 in H₂O (140 Pa) |
| Airflow Direction | Direction “A” |
| Direction of Rotation | Counterclockwise, viewed toward rotor |
| Fan Size | 250 mm (9.84 in) |
| Number of Blades | 9 |
| Blade Material | Sheet steel, painted black |
| Guard Grille Material | Steel, phosphated and coated with black plastic |
| Electronics Housing Material | Rotor: painted black |
| Motor Bearing Type | Dual Ball Bearing |
| Installation Position | Any |
| Condensation Drainage Holes | None |
| Operating Mode / Duty Cycle | Continuous operation (S1) |
| Weight | 2.2 kg (4.85 lbs) |
| Cable Specification | Lateral cable exit, AWG 20, 4x crimped splices |
| Wiring Pinout | Red: Un +24 VDC | Yellow: 0-10 VDC / PWM Control Input | White: Tach Output | Blue: GND |
| Control Input | 0-10 VDC / PWM (Input resistance Re > 100 kΩ) |
| Tachometer Output | 3 pulses per revolution (Isink max = 10 mA) |
| Technical Features | Soft start, motor current limitation, tach output, 0-10V / PWM control |
| Motor Protection | Reverse polarity and locked-rotor protection |
| Electrical Protection Class | Class I (with customer connection of protective earth) |
| Insulation Class | Class B |
| Ingress Protection (IP) | IP42 |
| Moisture / Environmental Class | F0 |
| Operating Temperature Range | -25 °C to +60 °C (-13 °F to +140 °F) |
| Storage / Transport Temperature Range | -40 °C to +80 °C (-40 °F to +176 °F) |
| EMC Immunity to Interference | According to EN 61000-6-2 |
| EMC Interference Emission | According to EN 55022 (Class B) |
| Certifications & Approvals | CSA C22.2 No. 77, EAC, UL 1004-1 |
Applications
The ebm-papst S1G250-AI37-52 EC axial fan is extensively deployed across battery thermal management systems (BTMS), mobile HVAC condensers, and telecommunications DC power distribution plant heat exchangers. It provides vital forced-convection cooling in transit vehicle electronic cabinets, commercial refrigeration display cases, inverter drive enclosures, and off-grid solar equipment racks. Its robust steel grille and resilient ball bearing assembly make it an ideal drop-in replacement for factory automation cells, medical chiller units, and industrial air handling equipment.
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